linux-kernel - Re: [PATCH] x86/iopl: Fake iopl(3) CLI/STI usage

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Message-ID: <CAHk-=whsG4LfNJHjeprDn0iR=zRGBUBtSSgLep=MqbEb8yBuuA@mail.gmail.com>
Date:   Fri, 17 Sep 2021 15:24:51 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ondrej Zary <linux@...y.sk>, Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/iopl: Fake iopl(3) CLI/STI usage

On Fri, Sep 17, 2021 at 3:23 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I think the proper thing to do is perhaps something like

The alternative is to just ignore cs_abse entirely, and just use
"regs->ip", which makes this all even easier.

If somebody uses a code segment _and_ cli/sti, maybe they should just
get the SIGSEGV?

               Linus